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The CT is part of a differential scheme protection delta(L)-Y grounded(H) Transformer. The relays are Schweitzer relays. I'm thinking that unless the relay is programmed to account for the reverse polarity connection of the load site CT, it may mis operate.

A delta-wye transformer will have a phase displacement. You will need to tell the relay about it and the CT configuration. Several Schweitzer models will have no problem.

The CT is part of a differential scheme protection delta(L)-Y grounded(H) Transformer. The relays are Schweitzer relays. I'm thinking that unless the relay is programmed to account for the reverse polarity connection of the load site CT, it may mis operate.

Here is a typical connection for an SEL 787. Looks very much like the scheme you posted.